Shell in plastic composition with up to 25% wood fibers. Sled base is made from Powder coated steel. The wood fiber and plastic blend is injected into the mold, forming the chair's shell. Wood base is cut from solid Oak wood and water-lacquered. For Stained Dark Brown version only: Please note that slight color variations can occur due to the inherent characteristics of the material. Clean with a moist cloth. If necessary use a little dish soap on the cloth. For upholstery versions, please find cleaning instructions for your chosen textile at kvadrat.dk. For leather upholstery versions: Clean the leather with a dry cloth regularly. Treat the leather at least four times a year using only special leather treatment products for aniline leather. Both versions with PU lacquer and water-based lacquer of this product can be cleaned with alcohol disinfectant. However, please note that as wooden products will get patina where the surface color can slightly fade. If cleaning is uneven, this may become even more apparent yet the lacquer will stay in place. For wooden products in lighter colors, the patina will be less apparent.